Anyway to tell the age of my hen?????

Just got my first two hens about 2 weeks ago and I sadly found 1 dead yesterday. Neither had laid any eggs for me. I believe maybe they are done laying eggs either for the season or because they are older. I live in SoFlo and it is still hot and sunny. My last standing hen does not seem to be molting either from what I can tell. She eats and forages and seems to be healthy.

She certainly looks like she's molting. She's likely over 18 months old, but no way to tell just how much over. She'll start laying again once the days start to get longer. If she's a 5 to 6 eggs a week layer, she's probably 2 to 3. If she only lays 3 to 4 or less a week, she's probably over 3.